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Control Method for use with a Steerable Drilling System

a control method and drilling system technology, applied in the direction of directional drilling, survey, borehole/well accessories, etc., can solve problems such as affecting the subsequent use of the well, and achieve the effect of simplifying the control of the drilling system

Inactive Publication Date: 2005-01-13
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a control method for a steerable drilling system that simplifies the process of controlling the system. The method uses data collected during drilling to predict the system's operation and compensates for operating conditions to reduce the risk of drilling a well bore that is too tight or too small in radius. The method also displays an ellipse diagram that allows an operator to see the system's response to different operating conditions and modify them to ensure the desired direction of drilling. Overall, the invention improves the efficiency and accuracy of drilling well bores.

Problems solved by technology

Such accumulation of water or gas may impair subsequent use of the well bore in the extraction of oil.

Method used

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  • Control Method for use with a Steerable Drilling System
  • Control Method for use with a Steerable Drilling System
  • Control Method for use with a Steerable Drilling System

Examples

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Embodiment Construction

[0018]FIG. 1 shows diagrammatically a typical rotary drilling installation of a kind in which the methods according to the present invention may be employed.

[0019] In the following description the terms “clockwise” and anti-clockwise” refer to the direction of rotation as viewed looking downhole.

[0020] As is well known, the bottom hole assembly includes a drill bit 1, and is connected to the lower end of a drill string 2 which is rotatably driven from the surface by a rotary table 3 on a drilling platform 4. The rotary table is driven by a drive motor indicated diagrammatically at 5 and raising and lowering of the drill string, and application of weight-on-bit, is under the control of draw works indicated diagrammatically at 6.

[0021] The bottom hole assembly includes a modulated bias unit 10 to which the drill bit 1 is connected and a roll stabilised control unit 9 which controls operation of the bias unit 10 in accordance with signals transmitted to the control unit from the sur...

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Abstract

A control method for use with a steerable drilling system comprises the steps of inputting parametric model data representative of drilling conditions and using the data to determine achievable drilling directions.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation in part of U.S. patent application Ser. No. 09 / 869,686 filed Oct. 9, 2001 which was filed as PCT application No. PCT / GB00 / 04291 filed Nov. 10, 2000, which claims priority from U.S. Provisional application No. 60 / 164,861 filed on Nov. 10, 1999.BACKGROUND OF INVENTION [0002] 3This invention relates to a method for use in controlling the operation of a steerable drilling system. The method is particularly suitable for use with a rotary steerable system, but may be used in other types of steerable drilling system used in the formation of subterranean wells. In particular, the invention relates to a method of predicting how a drilling system will operate, respond or react to various operating conditions and changes therein. [0003] One type of rotary steerable system comprises a downhole assembly including a drill bit. The drill bit is carried by a drill string which is rotated typically by a well head locat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B7/04E21B7/06E21B7/10E21B44/00E21B47/022
CPCE21B7/04E21B7/06E21B47/022E21B44/00E21B7/10
Inventor DOWNTON, GEOFF
Owner SCHLUMBERGER TECH CORP